Patent GB-816511-A (GB)
IPC: D04H1/587
Abstract: 816,511. Coating surfaces. BRITISH CELANESE Ltd. Feb. 21, 1957 [Feb. 22, 1956], No. 5486/56. Class 95. [Also in Groups VII, VIII and IX] A downproof fabric envelope is produced by depositing on one side of a fabric envelope a discontinuous particulate coating of a thermoplastic polymer of a mono-olefinically unsaturated compound by spraying an aqueous dispersion of said polymer on to the fabric and evaporating off the aqueous medium at a temperature below that at which any fibre in the fabric becomes soft or sticky, but advantageously such that the polymer particles spread and adhere to the fabric, without forming a coherent coating, e.g. at 50‹ C. to 100‹ C. The fabric may be a woven fabric of continuous filament yarns which may be composed of cellulose acetate, regenerated cellulose, vinyl polymers, e.g. polyvinyl chloride-acetate, polyvinylidene chloride, vinyl chloride copolymers, e.g. vinyl chloride-acrylonitrile, vinylidene chloride-acrylonitrile, homo- and co-polymers of acrylonitrile containing small proportions of vinyl pyridine, acrylamide, methyl acrylate, vinyl acetate, copolymers of vinyl acetate or like ethylenically unsaturated esters with a small proportion of a vinyl compound containing an acid group in the form of a salt, e.g. alkali metal salts of vinyl benzene sulphonic acid as disclosed in U.S.A. Specification 2,300,920, polyamides, e.g. nylon, polyesters, e.g. polyethylene terephthalate, or natural fibres, e.g. cotton, linen, silk or wool, or a mixture thereof. The coating, which may be present from 5 to 25 per cent by weight of the fabric, may comprise a copolymer of vinyl acetate which becomes sticky between 30‹ and 100‹ C., polyvinyl acetate, which may be plasticised, copolymers of vinyl acetate and of isopropyl acetate with maleic esters, vinyl esters, e.g. vinyl benzoate, and with vinyl chloride, polymerized acrylic and methacrylic esters of higher alcohols, e.g. polybutylacrylate, polybutylmethacrylate, polyisobutylacrylate, polyisobutyl methacrylate and copolymers of acrylic and methacrylic esters with vinyl esters. The dispersion may contain a protective colloid which may be present from 1 to 3 per cent of the dispersion,1 e.g. polyvinyl alcohol, copolymers of an akali metal methacrylate with minor proportions of methylmethacrylate, water-soluble copolymers of vinyl acetate, copolymers of styrene and salts of maleic acid, methyl cellulose, hydroxyethyl cellulose, alkali metal carboxy methyl cellulose, carbohydrates, polyvinylpyrrolidone, and copolymers of vinylpyrrolidone. A small proportion, e.g. 0.2 to 1 per cent of a wetting agent may also be present in the dispersion, e.g. dioctyl sodium sulphosuccinate, sodium dodecyl benzenesulphonate, sodium alkyl naphthalene sulphonate, alkyl phenyl polyethylene glycol ethers, polypropylene glycols, ethylene oxide adducts of cetyl and/or oleyl alcohols, polyethylene glycol oleates, and propylene oxide-ethylene oxide copolymers. The polymer may be internally or externally plasticised, e.g. using an alkyl ester of maleic, fumaric or itaconic acid, isopropenyl ester, dibutyl phthalate, di-(methyl cyclohexyl)-phthalate, triethylene glycol di-(2- ethyl) butyrate. Suitable stable dispersions are disclosed in Specifications 437,446, 466,173, 475,162, 511,036, 568,884, 577,861, [all in Group IV], 615,725, [Group XXIX], 641,653, 648,001 and 655,734, [all in Group IV (a)]. The envelope may be filled with loose fibrous materials, e.g. animal fibres, down, feathers, horsehair, kapok, batting, flock, wool fibres, which may also be lightly sprayed prior to insertion into the envelope, to produce eiderdowns, shoulder pads, pillows or cushions.